Account settings

Amazon ECS provides account settings, which provide a way to opt in or out of specific features. For each Region, you can opt in to or opt out of each account setting at the account level or for a specific IAM user or role.

The following are supported scenarios:

• An IAM user or role can opt in or opt out for their individual user account.

• An IAM user or role can set the default opt in or opt out setting for all users on the account.

• The root user can opt in to or opt out of any specific IAM role or user on the account. If the account setting for the root user is changed, it sets the default for all the IAM users and roles for which no individual account setting has been selected.

The following account settings are available. The opt in and opt out option must be selected for each account setting separately.

Amazon Resource Names (ARNs) and IDs

Resource names: serviceLongArnFormat, taskLongArnFormat, and containerInstanceLongArnFormat

Amazon ECS is introducing a new format for Amazon Resource Names (ARNs) and resource IDs for Amazon ECS services, tasks, and container instances. The opt-in status for each resource type determines the ARN format the resource uses. You must opt-in to the new ARN format to use features such as resource tagging for that resource type. For more information, see Amazon Resource Names (ARNs) and IDs.

Only resources launched after opting in receive the new ARN and resource ID format. All existing resources are not affected. In order for Amazon ECS services and tasks to transition to the new ARN and resource ID formats, the service or task must be re-created. To transition a container instance to the new ARN and resource ID format, the container instance must be drained and a new container instance registered to the cluster.

Note

Tasks launched by an Amazon ECS service can only receive the new ARN and resource ID format if the service was created on or after November 16, 2018, and the IAM user who created the service has opted in to the new format for tasks.

AWSVPC trunking

Resource name: awsvpcTrunking

Amazon ECS supports launching container instances with increased elastic network interface (ENI) density using supported Amazon EC2 instance types. When you use these instance types and opt in to the awsvpcTrunking account setting, additional ENIs are available on newly launched container instances. This configuration allows you to place more tasks using the awsvpc network mode on each container instance. Using this feature, a c5.large instance with awsvpcTrunking enabled has an increased ENI limit of ten. The container instance has a primary network interface, and Amazon ECS creates and attaches a "trunk" network interface to the container instance. The primary network interface and the trunk network interface don't count against the ENI limit. Therefore, this configuration allows you to launch ten tasks on the container instance instead of the current two tasks. For more information, see Elastic network interface trunking.

Only resources launched after opting in receive the the increased ENI limits. All existing resources are not affected. To transition a container instance to the increased ENI limits, the container instance must be drained and a new container instance registered to the cluster.

CloudWatch Container Insights

Resource name: containerInsights

CloudWatch Container Insights collects, aggregates, and summarizes metrics and logs from your containerized applications and microservices. The metrics include utilization for resources such as CPU, memory, disk, and network. Container Insights also provides diagnostic information, such as container restart failures, to help you isolate issues and resolve them quickly. You can also set CloudWatch alarms on metrics that Container Insights collects. For more information, see Amazon ECS CloudWatch Container Insights.

When you opt in to the containerInsights account setting, all new clusters have Container Insights enabled by default. You can disable this setting for specific clusters when you create them. You can also change this setting by using the UpdateClusterSettings API.

For clusters containing tasks or services using the EC2 launch type, your container instances must be running version 1.29.0 or later of the Amazon ECS agent to use Container Insights. For more information, see Amazon ECS Container Agent Versions.

Dual-stack VPC IPv6

Resource name: dualStackIPv6

Amazon ECS supports providing tasks with an IPv6 address in addition to the primary private IPv4 address.

For tasks to receive an IPv6 address, the task must use the awsvpc network mode, must be launched in a VPC configured for dual-stack mode, and the dualStackIPv6 account setting must be enabled. For more information on other requirements, see Using a VPC in dual-stack mode.

Important

The dualStackIPv6 account setting can only be changed using either the Amazon ECS API or the AWS CLI. For more information, see Modifying account settings.

If you had a running task using the awsvpc network mode in an IPv6 enabled subnet between the dates of October 1, 2020 and November 2, 2020, the default dualStackIPv6 account setting in the Region the task was running in is disabled. If that condition is not met, the default dualStackIPv6 setting in the Region is enabled.

Topics

• Amazon Resource Names (ARNs) and IDs
• ARN and resource ID format timeline
• Viewing account settings
• Modifying account settings

Amazon Resource Names (ARNs) and IDs

When Amazon ECS resources are created, each resource is assigned a unique Amazon Resource Name (ARN) and resource identifier (ID). If you are using a command line tool or the Amazon ECS API to work with Amazon ECS, resource ARNs or IDs are required for certain commands. For example, if you are using the stop-task AWS CLI command to stop a task, you must specify the task ARN or ID in the command.

The ability to opt in to and opt out of the new Amazon Resource Name (ARN) and resource ID format is provided on a per-Region basis. Currently, any new account created is opted in by default.

You can opt in or opt out of the new Amazon Resource Name (ARN) and resource ID format at any time. After you have opted in, any new resources that you create use the new format.

Note

A resource ID does not change after it's created. Therefore, opting in or out of the new format does not affect your existing resource IDs.

The following sections describe how ARN and resource ID formats are changing. For more information on the transition to the new formats, see Amazon Elastic Container Service FAQ.

Amazon Resource Name (ARN) format

Some resources have a user-friendly name, such as a service named production. In other cases, you must specify a resource using the Amazon Resource Name (ARN) format. The new ARN format for Amazon ECS tasks, services, and container instances includes the cluster name. For information about opting in to the new ARN format, see Modifying account settings.

The following table shows both the current (old) format and the new format for each resource type.

Resource type	ARN
Container instance	Old: arn:aws:ecs:region:aws_account_id:container-instance/container-instance-id New: arn:aws:ecs:region:aws_account_id:container-instance/cluster-name/container-instance-id
Amazon ECS service	Old: arn:aws:ecs:region:aws_account_id:service/service-name New: arn:aws:ecs:region:aws_account_id:service/cluster-name/service-name
Amazon ECS task	Old: arn:aws:ecs:region:aws_account_id:task/task-id New: arn:aws:ecs:region:aws_account_id:task/cluster-name/task-id

Resource ID length

A resource ID takes the form of a unique combination of letters and numbers. New resource ID formats include shorter IDs for Amazon ECS tasks and container instances. The old resource ID format was 36 characters long. The new IDs are in a 32-character format that does not include any hyphens. For information about opting in to the new resource ID format, see Modifying account settings.

ARN and resource ID format timeline

There is a timeline for the opt-in and opt-out periods for the new Amazon Resource Name (ARN) and resource ID format for Amazon ECS resources. The ARN and resource ID is set at the time of creation and does not change after that. Therefore, opting in or out of the new format does not affect the ARN or resource ID of your existing resources.

The following are the important dates related to this change.

• From now until September 30, 2020 – The ability to opt in to and opt out of the new Amazon Resource Name (ARN) and resource IDs is provided on a per-Region basis. Any new accounts created are opted out by default.

• October 1, 2020 - March 31, 2021 – All new accounts are opted in to the new format by default. Any existing accounts that have not explicitly opted out of the new format are also opted in. The ability to opt in and opt out continues to be available on a per-Region basis.

• April 1, 2021 – All accounts will be opted in by default. All new resources created will receive the new format. The ability to opt out will no longer be available.

You can modify your opt-in setting for the new Amazon Resource Name (ARN) and resource ID format at any time between now and April 1, 2021. After you have opted in, any new resources that you create use the new format.